133245520 has 20 divisors (see below), whose sum is σ = 309796020. Its totient is φ = 53298176.

The previous prime is 133245493. The next prime is 133245521. The reversal of 133245520 is 25542331.

It can be written as a sum of positive squares in 2 ways, for example, as 39388176 + 93857344 = 6276^2 + 9688^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (133245521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832705 + ... + 832864.

It is an arithmetic number, because the mean of its divisors is an integer number (15489801).

Almost surely, 2^133245520 is an apocalyptic number.

133245520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

133245520 is an abundant number, since it is smaller than the sum of its proper divisors (176550500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

133245520 is a wasteful number, since it uses less digits than its factorization.

133245520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1665582 (or 1665576 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 133245520 is about 11543.2023286435. The cubic root of 133245520 is about 510.7607766559.

Adding to 133245520 its reverse (25542331), we get a palindrome (158787851).

The spelling of 133245520 in words is "one hundred thirty-three million, two hundred forty-five thousand, five hundred twenty".